A kind of macromolecular photoinitiator containing benzophenone group and preparation method thereof

Abstract

The invention discloses a macromolecular photoinitiator containing diphenyl ketone groups and a preparation method of the macromolecular photoinitiator. The general structural formula of the macromolecular photoinitiator containing the diphenyl ketone groups is shown in the formula (I), wherein R1 refers to a methyl group or hydrogen; R2 refers to an alkyl group, hydrogen, an ethoxyl group or a hydroxypropyl group; R3 refers to an alkyl group, hydrogen or an ethoxyl group; R4-8 and R'4-7are separately selected from hydrogen or an alkyl group; R9 refers to a methyl group or hydrogen. The designed and synthesized macromolecular photoinitiator is obtained through copolymerization of a synthesized special polymerizable photoinitiator. According to the adopted polymerizable photoinitiator, two diphenyl ketone units contained in each molecule are fixed on two sides of a rigid triazine ring and are not contacted with each other, so that the probability of combination of adjacent free radicals is greatly decreased, and the photoinitiation efficiency is improved; meanwhile, the polymerizable photoinitiator contains amido hydrogen supply units, and accordingly, comonomers containing hydrogen supply components such as tertiary amine and the like are not required to be added additionally during preparation of the macromolecular photoinitiator.

Description

technical field

[0001] The invention belongs to the industrial field of radiation curing of polymer materials, and in particular relates to a macromolecular photoinitiator containing a benzophenone group and a preparation method thereof. Background technique

[0002] UV curing technology has the characteristics of no volatile organic solvents, fast curing speed, low energy consumption, and good performance of cured products, so it is widely used in coatings, inks, adhesives, photoresists, laser 3D printing and other fields.

[0003] In the traditional photocuring system, the residual small molecule photoinitiator or its photolytic fragments are easy to migrate from the cured coating to the surface, resulting in odor and even toxicity during the use of the product. One of the ways to avoid the above problems is to introduce unsaturated double bonds into small molecule photoinitiators, that is, polymerizable photoinitiators. By participating in polymerization, the small molec...

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